RFR: 8284780: Need methods to create pre-sized HashSet and LinkedHashSet [v17]

[XenoAmess]

> as title.

XenoAmess has updated the pull request incrementally with one additional commit since the last revision:

  do it as naotoj said

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8302/files
  - new: https://git.openjdk.java.net/jdk/pull/8302/files/230a767e..98bfb0e1

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8302&range=16
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8302&range=15-16

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8302.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8302/head:pull/8302

PR: https://git.openjdk.java.net/jdk/pull/8302